RESULTS AND DISCUSSION
One critical aspect of making latex foam is the alkalinity change in the latex after adding the sodium silicofluoride (SSF) dispersion. The gelling pH is an important characteristic because it will determine the physical strength of the gel. Figure 1 shows the pH change of the NRL latex mix and blend mix after the addition of SSF.
There was a gradual drop in the pH values after the addition of gelling agent. Both the